preflop size is way too large i think. but then again if he plays VPIP 60% maybe it could be good if he just calls with all sorts of crap which AJs dominates.

on the flop raising is fine but you have to raise/fold. i think given the way he played flop and turn you should have the best hand really often so i~ll consider betting half pot on the river too. despite the board being monotone, i think this guy is a huge whale and has so many worse JX hands.